<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>定位居中</title>
    <style>
    img{
        position: absolute;
        left: 50%;
        top: 50%;

        /* margin-left: -200px;
        margin-top: -200px; */

        /* 50% 就是自己宽高的一半 */
        transform: translate(-50%, -50%);
    }
    </style>
</head>
<body>
    <img src="../img/img01.jpg" alt="">
</body>
</html>